STOP-OFF PAINT FOR:
DEEP CASE CARBURIZING
Properties
CONDURSAL 710 is extremely effective as a stop-off paint for all forms of gas carburizing. It is particularly suitable for deep case carburizing up to depths of .120" Only one coating of CONDURSAL 710 is necessary for effective protection against carbon pickup. Therefore it is very economical. Because the residues of CONDURSAL 710 are not soluble in water, alkaline solution or solvents, they must be removed after heat treating by blasting or wire brushing. CONDURSAL 710 is free of any solvents, which is important in respect of health and safety regulations.
Condursal 710, paste consistency
This consistency is best suited for use with a dispensing gun, which applies the paste from a pressurized container. (Similar to grease gun equipment) This method of application can be easily mechanized for mass production - as recently shown in fully computerized installations at FORD and GM plants. It provides sharply defined layers with maximum efficiency and is particularly suited for the protection of external threads, short gear teeth, splines, etc.
Condursal 710 for spraying
In this case the rather liquid paint is applied using a pressurized container combined with spraying pistols, the nozzles of which normally have a diameter of .060 - .100". Spraying is most commonly used for continuous work, e.g., large series of pieces such as gears and axles.
Condursal 710 for immersion
This grade is best suited for components with the area to be protected located at one end, so that coating by dipping is possible. Its consistency adheres quickly and does not tend to drip off. It is recommended that the excessive paste at the bottom of the work piece be removed by shaking or wiping so that it can be recovered. As long as the paste is not fully dry it may be reconditioned by simply adding small quantities of the "Special Thinner for Condursal 710". When dipping the parts, it is useful to move the piece around to prevent air bubbles from sticking to the surface.
Condursal 710 for painting
This "normal" consistency is most commonly used for manual application, whenever the variety of work pieces or areas to be coated do not allow automatic or mechanized coating. Application of this paint is similar to oil based paint using a flat soft bristle brush.
Stop-off paint for Deep Case Carburizing up to depths of .120"
| Pricing (per can) | 1-5 cans | 6+ | case lot |
| CN-3K7 (1/2 gallon) | Call | Call | Call |
| CN-5K7 (gallon) | Call | Call | Call |
| Duffy Special Thinners | 1-5 cans | 6+ | case lot |
| CN-7QT Yellow Label | Call | Call | Call |
| CN-7GAL Yellow Label | Call | Call | Call |
CONDURSAL 710 Instructions For Use:
Before applying, stir the contents of the Condursal 710 tin thoroughly. As received, Condursal 710 is suitable for application by painting with a fine hair flat brush. Upon request, it is also available in spraying consistency (Condursal 710WE).
Prior to painting, the surface of the components to be protected must be cleaned thoroughly by either a vapor degreaser or a detergent washer, so that these areas are free of oil and grease.
Apply Condursal 710 as evenly as possible to a thickness of approximately 0.2 to 0.3 mm (.006" to .010").
Only one coating is necessary for effective protection.
After coating, the parts should be allowed to air dry for 2 to 3 hours before carburizing.
Special Notes:
1. Thorough drying of coating prior to heating is essential because spalling of the coating may occur when the work pieces are put into the furnace.
2. Condursal 710 is not suited for application using ammonia-based atmospheres such as carbonitriding.
During use, with the can open, Condursal 710 has a tendency to thicken due to evaporation of the liquid vehicle in the paint. Normal consistency can be restored by adding small amounts of "Special Thinners for Condursal 710". Avoid over thinning; it would impair the effectiveness of the paint.
Removal of Residues:
After carburizing and quenching, residues of Condursal 710 can be removed by blasting. They are not soluble in water or solvents.
Cleaning of brushes and other equipment:
Immediately after use, Condursal 710 cans should be tightly resealed and the brushes, etc. cleaned with water. Deposits, as well as contents of can, cannot be rejuvenated if the liquid vehicle becomes dry.
Therefore, if painting has to be interrupted for some period of time, brushes should be set into water to prevent the bristles from drying and getting hard.
Storage:
Cans of Condursal 710 should be stored in a dry cool place. Please prevent from freezing.
Trouble Shooting Preface:
Condursal 710 is as easily applied as an oil based paint. As with all painting, it is important to clean and degrease the surfaces to be coated thoroughly. A soft bristle brush should be used to insure a uniform coating thickness. Allow the coating to dry thoroughly before the work piece is put into the furnace. The following list is provided to address possible causes on ineffective stop-off of this paint.
CONDURSAL 710 Trouble Shooting:
Trouble
Paint runs off after applying by painting, spraying or immersion.
Possible Reasons:
1. work pieces have not been degreased satisfactorily prior to coating.
2. paint has not been stirred.
3. Paint has been thinned excessively.
4. Paint has been applied in too thick a coating.
How to Avoid:
Clean parts thoroughly by vapor degreasing or alkaline washing.
Trouble
Paint runs off in the carburizing furnace.
Possible Reasons:
1. Paint has been applied in too thick a layer/ coating has not been allowed to dry thoroughly.
2. Coated parts have been stored for too long a period at high atmospheric humidity.
3. Parts have been preheated at temperatures of more than 400 degrees F. with oxygen present.
4. Coating has come into contact with humidity in the carburizing furnace due to:
- defective endothermic generator.
- leaking of retort cooling system.
- incomplete cracking of liquid carburizing media
- putting coated parts in the furnace together with other work pieces insulated with water or silicate based stop-off paint.
5. Coating has come into contact with oxygen in the carburizing furnace due to:
- incorrect atmosphere regulation.
- cracking/ leaking of the retort of the furnace.
How to Avoid:
Apply paint in a thin coating of uniform thickness (.008-.012") and let dry thoroughly.
Trouble
Residues of the paint are hard to remove after carburizing/ surface attack is noted.
Possible Reasons:
1. Coating has come into contact with humidity.
2. Coated parts have been cooled down after carburizing and then reheated for quenching.
How to Avoid:
SEE RUN-OFF PROBLEMS
Remove residues of the parts after carburizing.
Trouble
Residues of the paint are hard to remove after carburizing/ surface attack is noted.
Possible Reasons:
1. Coating has come into contact with humidity.
2. Coated parts have been cooled down after carburizing and then reheated for quenching.
How to Avoid:
SEE RUN-OFF PROBLEMS
Remove residues of the parts after carburizing.
Trouble
Protection against carbon pickup has been found to be non-uniform or non-satisfactory.
Possible Reasons:
Paint has been applied in a too thin or non-uniform layer.
How to Avoid:
Stir paint thoroughly prior to use; apply paint in a layer of even thickness; if necessary for deep cases apply twice but keep in mind that first coating must be dry prior to application of second one.